Atomic hydrogen behaviour in Heliotron E

K. Muraoka, K. Uchino, M. Maeda, T. Kajiwara, K. Matsuo, T. Okada, C. Honda, Y. Suehiro, N. Yano, K. Takeda, H. Hagiwara, M. Akazaki, S. Sudo, K. Kondo, H. Matsuura, T. Mizuuchi, F. Sano, M. Sato, H. Zushi, T. Obiki

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In order to understand atomic hydrogen behaviour and particle confinement properties in Heliotron E plasmas, techniques of laser induced fluorescence (LIF) have been extensively used, combined with measurements of absolute Balmer alpha emissions and density fluctuations. The results revealed that for an average electron density n ̄e > 1.5 × 1019 m-3, Hα fluorescence allowed the measurements of atomic hydrogen densities and yielded the recycled Franck-Condon neutrals (~ 3 eV) to penetrate into core plasmas, whereas for n ̄e < 1.0 × 1019 m-3, such measurements were perturbed by dissociative-excitation of H2 molecules into the n = 2 state. Also, the global confinement times showed a clear correlation with electron density fluctuations.

Original languageEnglish
Pages (from-to)231-235
Number of pages5
JournalJournal of Nuclear Materials
Issue numberC
Publication statusPublished - Dec 3 1990

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • General Materials Science
  • Nuclear Energy and Engineering


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